A column form is okay, but a little harder to deal with,
as the program will treat them as global times (of the
concatenated runs), as opposed to local times (local to
each run).

So a 3 run timing file of 50, 2 second TRs might read
this as local times:

7 24 29.3 81
*
42 43.5 79

Notice that run 2 has no stimuli, and that '*' serves
as a placeholder (essentially, for a stimulus at time
infinity).

The same list of numbers in global, column format (with
each run lasting 100 seconds), would look like:

7
24
29.3
81
242
243.5
279

For more details, see the Misc Document on the changes
for Summer, 2004:

[afni.nimh.nih.gov]
[afni.nimh.nih.gov]

- rick